Curb laying machine



May 3, 1955 6 Sheets-Sheet 1 Filed Feb.

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WILLIAM E. CANFIELD.

ATTORNEYS.

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cum; LAYING momma Filed Feb. 16. 1953 6 Sheets-Sheet 3 ATTORNEYS.

May 3; 1955 w. E. CANFIELD 2,707,422

cuas wane MACHINE Filed Feb. 16. 1953 a Sheets-Sheet 4 1 7 130N319 BY :mfi

ATTORNEY-5.

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CURB LAYING MACHINE Filed Feb. 16. 1953 6 Shasta-Sheet 5 WILLIAM ECANFIELD,

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May 3, 1955 w. E. CANFIELD CURB LAYING manna 6 Sheets-Sheet 6 Filed Feb. 16. 1953 E W555: 51%,, Am

ATTORNEYS- Unitcd States Patent 6 cone LAYING MACHINE William E. Canfield, Albemarle, N. C., assignor, by mesne assignments, to E. L. Hardin Associates, Inc.

Application February 16, 1953, Seriai No. 337,057

6 Claims. (Cl. 94-46) wheels, if desired, for supporting the framework and said framework having thereon a hopper into which asphalt paving material, concrete paving material or any other suitable paving material may be dumped. This hopper connects with an elongated pipe in which a driven screw is provided for propelling the paving mixture rearwardly of the pipe. The pipeis cornmunicatively connected to a form preferably of generally inverted U-shaped crosssectional configuration, though other types offorms may be employed.

The rear end of said form is open and, when the screw is driven, the paving material is forced into the form and temporary restraining means will be employed, like a'shovel, to close the rear end ofv the form duringinitial operation of the apparatus after which said restraining means isremoved whereby the paving material will be packed into the form and the force of the screw in packingthe material into the form will propel the apparatus along a pavement onto which the curb is being deposited so that the apparatus is moved solely by the fact that the packing of the material in the form will advance the apparatus and the form and apparatus will gradually move forwardly as the curb is formed.

Some of theobjects of the. invention having been stated, other, objects will appear as the description proceeds,

when taken in connection with the accompanying drawings, in which Figure 1 is a side elevation of the apparatus;

Figure 2 is a top plan view of the apparatus;

Figure 3 is a side elevation showing the reverse side from that shown in Figure l with a portion of the handles being broken away;

Figure 4 is a longitudinal sectional view through the apparatus taken substantially along the line 4-4: in Figure 2;

Figure 5 is a rear elevation of the apparatus;

Figure 6 is a front elevation of the apparatus with the handles broken away,

Figure 7 is a vertical sectional view taken substantially along the line 7-7 in Figure 1;

Figure 8 is a vertical sectional view taken substantially along the line 8-8 in Figure 1;

Figure 9 is a longitudinalsectional view through the conventional slip clutch mechanism taken substantially along the line 9-9 in Figure 8;

Figure 10 is a fragmentary longitudinal sectional view of the rear portion of the apparatus similar to the right handend of Figure 4, but showing the paving material ZJWAZL Patented May 3, iii-$532 ice disposed within the hopper and within the form and extending behind the form;

Figure 11 is a sectional plan view taken substantially along the line 11--11 in Figure 3;

Figure 12 is a vertical sectional view taken substantially along the line 12-12 in Figure 5;

Figure 13 is a longitudinal sectional view similar to Figure 10, but showing the mold in two sections;

Figure 14 is a view mostly in elevation. looking from along the line 14-14 in Figure 13;

Figure 15 is an isometric view of the mold and associated parts removed from the machine and looking forwardly from the remote side of the rear end of Figure 13.

Referring more specifically to the drawings, the numerals 1t) and 11 indicate upper and lower longitudinally extending side frame members which are secured in spaced relation to each other by means of uprights 12, 13 and 14 while the longitudinal extending frame bars on the other side of the apparatus are indicated by ref erence characters 16 and 17 secured in spaced relation to each other by upright bars 18, 19, 2t}, 21 and 22 Figure 3).

The upper longitudinal frame bars 10 and 16 are joined together by suitable cross bars 30, 31, 32, 33, 34 and $5. The lower longitudinal frame bars 11 and 17 have suitably secured thereto wear or slide bars or skids 36 and 37 which when worn away by sliding on the pavement can be replaced to prevent injury to the lower bars 11 and 17.

The cross bar has secured thereto a plate member 40 (Figures 1 to 3, inclusive, and 6) in which is rotatably mounted a threaded vertical shaft 41 having a handle 42 on the upper end thereof. The lower surface of plate 46 has welded thereto a suitable threaded plate 43 in which the threaded portion of shaft 41 is mounted. Immediately below the plate 56, and in spaced relation thereto, is a plate 45 which has its rear edge welded to the upright bars 12 and 22 and is slidably penetrated by the shaft 41. The shaft 41 also rotatably penetrates two parts of a suitable ball thrust bearing assembly 46 which has secured to the lower surface thereof a plate 47 to which is secured the upper or closed end of an inverted U-shaped caster frame 50 and which frame St is rotatably penetrated by a restricted portion 51 on the lower end of the shaft or screw 41.

The lower end of the restricted portion 51 is bradded or peened, as at 53, in such a manner as to allow the caster frame 50 to rotate freely on the restricted portion 51. A suitable wheel 55 is rotatably mounted in the lower end of the inverted U-shaped member 50, on an axle 56.

Bars and 61 are pivotally mounted at one end on the upright bars Hand 22, as at 62, and each of these bars 69 and 61 at their rearward ends has an arcuate slot 65 (Figure 4) penetrated by a bolt 66 to adjustably secure the rear ends of the bars 60 and 61 to facilitate regulating the elevation of the wheels associated therewith to be presently described. The bars 60 and 61 have opposite ends of a shaft es fixed therein on which a pair of wheels 69 and 70 are rotatably mounted. The purpose of this arrangement is to support the frame off of the pavement, if desired, or to raise the wheels 69 and 70 off the pavement so as to allow the bars 36 and 37 to rest on the pavement to retard movement of the frame, for purposes to be later described.

The front end of the frame has rising upwardly therefrom a pair of pipe members and '76 whose lower ends are welded to the top longitudinally extending frame bars 10 and 16 and are additionally supported by suitable braces 77 and 78. A suitable U-shaped handle member 80 has its free ends adjustably secured in the pipe mema bers and 6 by set screws 79. The purpose of this handle member 80, which is located at the front end of the apparatus, is to guide the apparatus in the desired direction.

The rear upright members 14 and 18 each has rigidly secured thereto, a plate member 90, each of which has a horizontally projecting portion 91 on its upper end threadably penetrated by a shaft 92 (Figures 11 and 12) having a suitable handle 93 thereon. The lower end of shaft 92 has a restricted portion 94 which rotatably penetrates a horizontal projection 95 of a vertically sliding plate 96 which is slotted at 97 and 93. Said slots 97 and 98 are penetrated by bolts 99 which also penetrate the corresponding plate member 90 and one of the flanges of the upright members 14 and 18. By this means, the members 96 can be adjusted vertically by turning the handle 93 and shaft 92 in the desired direction to move the member 96 which is guided by the bolts 99. Each of the members 96 has rearwardly projecting spaced portions 103 and 104 suitably secured thereto between which a wheel 105 is rotatably mounted on a suitable axle 1116.

A suitable hopper is provided for receiving the paving material and extends downwardly and is adapted to feed the paving material to a conveying and packing means. The hopper 111) has an open bottom and immediately above the open bottom, and to opposed sides of the hopper, a pair of bars 112 and 113 are bolted which are welded to a pipe or tubular member 114. The lower open bottom of the hopper 110 mates with an opening 115 in the pipe 114 (Figure 4). of opposite side walls of the hopper 110 rest on and are secured to suitable angle bars and 121 (Figures 3 and 7) secured on top of the longitudinally extending top frame bars 10 and 16.

The pipe 114 is open at its rear end and is closed at its front end by a plate 123 which has out-turned lugs at each end thereof secured to the bottom longitudinally extending frame bars 11 and 17, respectively (Figure 4). The pipe 114 also rests upon a transverse support bar 125 disposed between the lower longitudinally extending frame bars 11 and 17.

Secured to the rear or open end of pipe 114 is a mold which is open at its rear end and this mold has angle bars 131 and 132 suitably secured to the outer lower surfaces thereof which, in turn, are suitably secured, as shown in Figures 7 and 11, to suitable angle clips 133, there being two on each side of the mold 130 and these angle clips 133 are suitably secured to the bottom longitudinally extending frame bars 11 and 17, such as by welding. ,The front end of the mold 130 is secured to the rear open end of the pipe 114 with suitable screws 135. This mold 130 is additionally secured by a pair of downwardly projecting plate members 136 and 137 (Figures 4, 8 and 10) Whose lower edges conform to the shape of the mold to give additional support to keep it from being pressed to first one side or the other. These plate members 136 and 137 have their edges suitably secured to the cross bars 32 and 30, respectively.

Disposed within the pipe 114 is a screw conveyor 140 which is fixed by a bolt 139 (Figure 10) on a shaft 141 which rotatably projects through the front plate 123 and is rotatably mounted in a bearing 144 (Figure 4). The shaft 141 projects further forwardly and is rotatably mounted in a bearing 145 fixed on a transverse angle bar 146 which is supported by the lower longitudinal frame members 11 and 17 (Figures 1, 3. 4 and 8).

The shaft 141 has fixed thereon a sprocket wheel 150 which has mounted thereon a sprocket chain 151 which extends upwardly and is mounted on a sprocket wheel 152 fixed on a shaft 153 mounted in bearings 154 and 155 mounted on top of cross bars 33 and 34 (Figures 4 and 8). The shaft 153 has, also fixed thereon, a larger sprocket wheel which has a sprocket chain 161 mounted thereon and which sprocket chain is also The medial portions mounted on a sprocket wheel 162 rotatably mounted on a shaft 163.

The sprocket wheel 162 is integral with a flanged portion 165 (Figure 9) which has a brake lining 166 secured to the rear surface thereof which is engaged by a disk 167 loosely surrounding a hub portion 168 connecting the sprocket wheel 162 and the flange 165. The disk 167 is penetrated by a plurality of bolts 170 which also penetrate a cup-shaped member 171 which is fixed, by any suitable means such as a set screw 172, to the shaft 163. The bolts 170 loosely penetrate the cup-shaped member 171 and extend a substantial distance forwardly of same and have suitable compression springs 175 mounted thereon and each bolt has a nut 176 for confining the spring 175. By adjusting the positions of the nuts 176 the friction between the brake band 166 and the disk 167 may be adjusted. This is a conventional type of slip clutch.

The shaft 163 extends rearwardly and is mounted in bearings 180 and 181 (Figures 2, 3 and 5) mounted on the upright frame members 19 and 20 and the rear end of shaft 163 has fixed thereon a sprocket wheel 183 which has mounted thereon a sprocket chain 184 also mounted on a sprocket wheel 185 fixed on motor shaft 186 of a suitable internal combustion motor 187 supported by the transverse frame bars 31 and 32.

In Figures 13, 14 and 15 a slightly modified form of the invention is shown where, instead of having one continuous inverted U-shaped mold 130, the mold is divided into two sections 130a and 13011. The section 130a is of an inverted U-shape similar to the mold 130, but is shorter than the mold 130 and has secured to the outer end thereof, by suitable bolts 134, the member 130]; which starts out at the front end as being inverted U- shaped in cross-section, but then is changed in form as it extends rearwardly to provide a mold as shown in Figures 13 to 15, inclusive, which will form a paving strip having an upright portion 147 and a horizontal portion 148,'the portion 147 forming the upright curb and the horizontal portion 148 being that portion which is usually flush with the paving of the street when the paving is laid after the curb has been placed in position.

Section 130a has an angle bar 132a secured to the lower edge thereof and the section 13% also has angle bars 131b and 132b (Figures 14 and 15) secured to the lower edges thereof. The angle bar which would bear the reference character 131a is not shown in the draw ings, but would correspond to the angle bar 132a, but be opposite hand.

It is to be understood that the aggregate used in this machine must be of proper consistency. Suitable con crete mixture may be employed or asphaltic material may be used, the only requirement being that it must be of a proper consistency to cause the screw 120 to pack the material properly in the mold and it must be of a consistency where it will pack properly and will become set sufiiciently by the time the mold moves off the same so that it will remain set and not settle. If the aggregate is too dry and too thick there will be voids in the paving and if it is too fluid it will tend to flatten out after the rear end of the mold passes from over the curbing formed.

In the instance of asphaltic material being used, as exemplified in Figures 13 and 14 a coating of adhesive, such as tar T, would usually be applied to the surface over which the curb is to be formed and the paving material P would then be formed thereon.

In the drawings and specification there has been set forth a preferred embodiment of the invention and although specific terms are employed, they are used in a generic and descriptive sense only, and not for purposes of limitation, the scope of the invention being defined in the claims.

I claim:

1. Apparatus for forming strips of paving material, such as curbs and the like, on a surface, comprising a framework having a hopper thereon into which paving material is adapted to be placed, a horizontally disposed pipe disposed below the hopper and secured to and extending longitudinally of the framework and communicating intermediate its ends with the lower end of the hopper, the front end of the pipe being closed and the rear end being open, an elongated mold secured to and extending longitudinally of the framework and being open at both ends and having sidewalls extending downwardly into close proximity to the surface which supports the framework and having its front end connected to the i open rear end of said pipe, said framework having a pair of vertically adjustable wheels near its rear end for sup porting the rear end of the framework clear of a surface on which it is disposed and having at least one front wheel, a screw conveyor in said pipe, means for driving the screw conveyor to force paving material from the hopper into said mold under pressure to pack the paving material into the mold and, due to the pressure exerted on the paving material by the screw conveyor, to move the apparatus forwardly at a rate of travel directly proportional to the amount of paving material forced into the mold.

2. Apparatus for forming raised strips of paving material such as curbs and the like on a surface, comprising a framework having a pair of vertically adjustable rear wheels and a pair of vertically adjustable front wheels, and a vertically adjustable front caster wheel for raising the front end of the framework to raise the front wheels out of contact with said surface, a hopper thereon into which paving material is adapted to be placed, a hori-- zontally and longitudinally disposed pipe disposed below the hopper and communicating intermediate its ends with the lower end of the hopper, the front end of the pipe being closed and the rear end being open, a longitudinally extending and horizontally disposed elongated mold substantially of an inverted U-shape in cross-section and open at both ends and having sidewalls extending down wardly into close proximity to the surface which supports the framework and having its front end connected to the rear end of the pipe, a screw in said pipe, means for driving the screw to force paving material from the pipe into said mold under pressure to pack the paving mate rial into the mold and, due to the pressure exerted on the paving material by the screw, to move the apparatus forwardly at a rate of travel directly proportional to the amount of paving material forced into the mold.

3. Apparatus for forming raised strips of paving ma terial such as curbs and the like on a surface, comprising a wheeled framework having a hopper thereon into which paving material is adapted to be placed, a horizontally dis- I posed and longitudinally extending pipe disposed below the hopper and communicating intermediate its ends with the lower end of the hopper, the front end of the pipe being closed and the rear end being open, an elongated mold substantially of an inverted U-shape in cross-see tion and open at both ends and having its front end secured to the rear end of the pipe and having sidewalls extending downwardly into close proximity to the surface which supports the framework, vertically adjustable wheels mounted in the framework for adjusting the vertical position of the frame relative to the surface on which it is supported, a screw in said pipe, means for driving the screw to force paving material from the pipe into said mold under pressure to pack the paving material into the mold and, due to the pressure exerted on the paving material by the screw, to move the apparatus forwardly at a rate of travel directly proportional to the amount of paving material forced into the mold.

4. Apparatus for forming strips of paving material such as curbs and the like on a surface comprising a framework having a front end and a rear end and having a hopper thereon into which paving material is adapted to be placed, a horizontally disposed pipe disposed and longitudinally extending below the hopper and communicating with the lower end of the hopper, the rear end of the pipe being open, an elongated mold mounted in and extending longitudinally of the framework and being open at both ends and at its bottom and having sidewalls extending downwardly into close proximity to the surface which supports the framework, the front end of the mold being secured to the rear end of the pipe, a screw in said pipe, a plurality of wheels mounted in the framework for holding all portions of the framework out of contact with the surface over which the framework is adapted to travel, means for driving the screw to force paving material flowing from the hopper by gravity into said mold under pressure to pack the paving material into the mold and, due to the pressure exerted on the paving material by the screw, to move the apparatus forwardly at a rate of travel directly proportional to the amount of paving material forced into the mold.

5. Apparatus for forming curbs on a suitable surface from a suitable paving material comprising a framework having a hopper thereon for receiving paving material, a horizontally disposed and rearwardly extending pipe disposed below and communicating with the lower end of the hopper, the rear end of the pipe being open, a screw disposed in said pipe, means for driving the screw to propel paving material from the rear end of the pipe, an elongated mold having its front end secured over the rear open end of the pipe, front and rear supporting wheels mounted in the framework, said mold having an open bottom and an open rear end, said screw being adapted to pack the paving material into the mold and to thus move the apparatus forwardly due to the pressure on the material in the mold, the mold being formed of front and rear sections removably secured together, the front section being substantially of an inverted U-shape in cross-section and the rear portion of the mold having a cross-sectional outline differing from the outline of the front section.

6. Apparatus for forming a strip of pavement in the form of a curb on a suitable surface from a suitable paving material comprising a framework having a hopper thereon for receiving paving material, front and rear wheels for supporting the apparatus out of contact with said surface, the front wheels being vertically adjustable, a pilot caster wheel mounted on the front end of the framework and being vertically adjustable to raise the front wheels off said surface, an elongated pipe extending longitudinally of the apparatus and disposed below and communicating with the lower end of the hopper and having its rear end open, a driven screw disposed in said pipe, means for driving the screw to propel paving material from the rear end of the pipe, an elongated mold having its front end secured over the rear open end of the pipe, said mold having an open bottom and an open rear end, said screw being adapted to pack the paving material into the mold and to thus move the apparatus forwardly due to the pressure on the material in the mold.

References Cited in the file of this patent UNITED STATES PATENTS 291,849 Howson Jan. 8, 1884 817,383 McIntyre Apr. 10, 1906 1,090,229 Ransome Mar. 17, 1914 1,193,459 Fraisher Aug. 1, 1916 1,877,577 Palmer Sept. 13, 1932 2,225,015 Lebelle Dec. 17, 1940 2,636,425 Heltzel Apr. 28, 1953 

